A man who lives in a house close to the accident site heard the four-wheeler revving sometime between 11:30-11:45 a.m., Trooper Chandler Poore said. “That’s the only indication we have as to when the accident happened,” he said.

The airman had only bought the vehicle a couple of days earlier and was not an experienced four-wheeler driver, the trooper said.

“It just flipped on him,” Poore said.

The cause of the vehicle’s flipping is not known; Poore was found pinned underneath, the statement said.